Week_3_loops

# Week_3_loops - CMPT120 J Ye Control Structures(2 Loops Week...

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CMPT120 J. Ye Control Structures (2) -- Loops ( Week 3 ) CMPT120 J. Ye 1 for loop while loop Variables Arithmetic expressions Boolean expressions Conditional statements User input 2 Last week:

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CMPT120 J. Ye Iteration structures allow us to execute the same instructions multiple times Often they are referred to as loops Like conditional statements, they are controlled by boolean expressions We examine two kinds of loops: the for loop the while loop A programmer should choose the right kind of loop for a situation Iteration (Repetition) Structures 3 The for Loop This is a for loop block , in this loop, the instruction print(“123”) is repeated 5 times for n in range(5): print(“123”) 4
CMPT120 J. Ye Range function For example: range(n) generates a list of integers: [0, 1, 2, …, n -1] range(i,j) generates a list of integers [i, i+1, i+2, ..., j-1] range(3,12,2) generates a list of integers [3, 5, 7, 9, 11] for n in range(5) can be interpreted as:

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